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Surface segregation at the aluminum interface of poly(3-hexylthiophene)/fullerene solar cells
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The effects of thermal annealing before and after Aldeposition on poly(3-hexylthiophene) butyric acid methyl ester (PCBM) blend solar cells were investigated by current density-voltage measurements and x-ray photoelectron spectroscopy(XPS). Compared to the preannealed device, the postannealed device exhibited enhanced open-circuit voltage , which is ascribed to the decrease in the reverse saturation current density . The XPS measurements demonstrated that P3HT is dominant at the Al interface in the preannealed device while PCBM is instead dominant in the postannealed device. This surface-segregated PCBM formed in the postannealed device can serve as a hole-blocking layer at the Al interface to reduce , and therefore improve .
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